I just discovered answer for myself:
from sqlalchemy.orm.properties import RelationProperty
from sqlalchemy.orm import class_mapper
def foo(entity_class, collection_property):
rel_prop = class_mapper(entity_class, compile=False).get_property
(collection_property)
related_entity_class = rel_prop.backref.prop.parent.class_ #
equals to <class Sea>
backref_attr = rel_prop.backref.key # equals to 'ocean'
Cool!
On Aug 4, 10:31 pm, "nail.xx" <nail...@gmail.com> wrote:
> Hi all!
>
> I have following model classes:
>
> Entity = sqlalchemy.ext.declarative.declarative_base(name='Entity')
> class Ocean(Entity):
> __tablename__ = 'oceans'
> id = sqlalchemy.Column(sqlalchemy.Integer, primary_key=True)
> name = sqlalchemy.Column(sqlalchemy.String(20), nullable=False)
> class Sea(Entity):
> __tablename__ = 'seas'
> id = sqlalchemy.Column(sqlalchemy.Integer, primary_key=True)
> name = sqlalchemy.Column(sqlalchemy.String(20), nullable=False)
> ocean_id = sqlalchemy.Column(sqlalchemy.String(20),
> sqlalchemy.ForeignKey(Ocean.id))
> ocean = sqlalchemy.orm.relation(Ocean, backref='seas')
>
> So instances of Ocean have seas property. The question is, if I have a
> function:
>
> def foo(entity_class, collection_property):
> # ...
>
> that is called width args entity_class=Ocean,
> collection_property='seas' could I anyhow to understand from within
> this function that 'seas' is assotiated with Sea class and that
> Sea.ocean is used to bind a Sea to the Ocean?
>
> Is it ever possible? Thanks
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